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arXiv 0903.1328astro-ph.HE
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2005年银河系纳米类星体爆发的演化

QPO Evolution in 2005 Outburst of the Galactic Nano Quasar GRO J1655-40

D. Debnath, A. Nandi, P. S. Pal, S. K. Chakrabarti

摘要:

GRO J1655-40在2005年2月的最后一周显示出显著的X射线活动,并在接下来的260天内保持活跃。这一特殊爆发的上升和下降阶段显示了康普顿化区域系统运动的证据,假设该区域是CENBOL,这导致了准周期振荡或QPO。我们提出了从这两个硬光谱状态的RXTE/PCA数据的光谱和定时结果。假设QPO起源于振荡冲击CENBOL,我们展示了如何在上升阶段以恒定速度缓慢地通过吸积流移动,并在下降阶段的后期加速向外。通过对观测频率的拟合,我们提取了不同圆盘参数的时间变化,如激波位置、速度等。

英文摘要:

GRO J1655-40 showed significant X-ray activity in the last week of February, 2005 and remained active for the next 260 days. The rising and the decline phases of this particular outburst show evidence for systematic movements of the Comptonizing region, assumed to be a CENBOL, which causes the Quasi-periodic Oscillations or QPOs. We present both the spectral and the timing results of the RXTE/PCA data taken from these two hard spectral states. Assuming that the QPOs originate from an oscillating shock CENBOL, we show how the shock slowly moves in through the accretion flow during the rising phase at a constant velocity and accelerate away outward during the later part of the decline phase. By fitting the observed frequencies with our solution, we extract time variation of various disk parameters such as the shock locations, velocity etc.

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